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Mashantucket Pequot Water System

Connecticut — Community Water System — PWSID: 010106001

System Information

PWSID010106001
System NameMashantucket Pequot Water System
System TypeCommunity Water System
Water SourceGround Water Under Influence
Activity StatusActive
Owner TypeNative American
EPA Region01
Serves SchoolNo
WholesalerYes
First ReportedJan 4, 1985
Last ReportedNov 19, 2025

Location & Contact

StateConnecticut
CityMASHANTUCKET
ZIP Code06339-3060
AddressTribal Office
OrganizationMashantucket Pequot Tribal Utilities
Phone8603966740

Population & Service

Population Served26,445
Service Connections154

Drinking Water Violations (171)

This water system has 171 violations recorded in the EPA SDWIS database.

Begin Date End Date Contaminant Category Health-Based Major Measured Federal MCL State MCL Status Return to Compliance Rule
Jul 1, 2024 — Consumer Confidence Rule Other No No — — — Unaddressed — Consumer Confidence Rule
Nov 1, 2018 — Revised Total Coliform Rule RPT No No — — — Resolved Jan 8, 2019 Revised Total Coliform Rule
Oct 1, 2018 Dec 31, 2018 TTHM MCL Yes No .0839 MG/L 0.080 mg/L — Resolved Dec 31, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2018 Dec 31, 2018 TTHM MCL Yes No .0839 MG/L 0.080 mg/L — Resolved Dec 31, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2018 Dec 31, 2018 TTHM MCL Yes No .0839 MG/L 0.080 mg/L — Resolved Dec 31, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Aug 9, 2018 — TTHM MR No No — 0.080 mg/L — Resolved Dec 26, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Aug 9, 2018 — TTHM MR No No — 0.080 mg/L — Resolved Dec 26, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Aug 9, 2018 — TTHM MR No No — 0.080 mg/L — Resolved Dec 26, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 — TTHM MR No No — 0.080 mg/L — Resolved Dec 26, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 Sep 30, 2018 TTHM MCL Yes No .088 MG/L 0.080 mg/L — Resolved Sep 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 Sep 30, 2018 TTHM MCL Yes No .088 MG/L 0.080 mg/L — Resolved Sep 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 Sep 30, 2018 TTHM MCL Yes No .088 MG/L 0.080 mg/L — Resolved Sep 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 — TTHM MR No No — 0.080 mg/L — Resolved Dec 26, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 — TTHM MR No No — 0.080 mg/L — Resolved Dec 26, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Dec 31, 2016 2,4,5-TP MR No Yes — 0.05 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 LASSO MR No Yes — — — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Heptachlor MR No Yes — 0.0004 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 LASSO MR No Yes — — — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Diquat MR No Yes — 0.02 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Heptachlor MR No Yes — 0.0004 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Heptachlor MR No Yes — 0.0004 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 2,4-D MR No Yes — 0.07 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 2,4-D MR No Yes — 0.07 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 2,4-D MR No Yes — 0.07 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Atrazine MR No Yes — 0.003 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 2,4,5-TP MR No Yes — 0.05 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 2,4,5-TP MR No Yes — 0.05 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Endothall MR No Yes — 0.1 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 HEXACHLOROBENZENE MR No Yes — 0.001 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 HEXACHLOROBENZENE MR No Yes — 0.001 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Benzo(a)pyrene MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Benzo(a)pyrene MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Endrin MR No Yes — 0.002 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Picloram MR No Yes — 0.5 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 OXAMYL MR No Yes — 0.2 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Endrin MR No Yes — 0.002 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 OXAMYL MR No Yes — 0.2 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Simazine MR No Yes — 0.004 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Simazine MR No Yes — 0.004 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Simazine MR No Yes — 0.004 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Picloram MR No Yes — 0.5 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Picloram MR No Yes — 0.5 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Endothall MR No Yes — 0.1 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Dinoseb MR No Yes — 0.007 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Dinoseb MR No Yes — 0.007 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Dinoseb MR No Yes — 0.007 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Carbofuran MR No Yes — 0.04 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Carbofuran MR No Yes — 0.04 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Atrazine MR No Yes — 0.003 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals
Jan 1, 2016 Dec 31, 2016 Endothall MR No Yes — 0.1 mg/L — Resolved Dec 31, 2016 Synthetic Organic Chemicals

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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